Power storage device, battery management unit, and electronic device

Abstract

A repeatedly bendable power storage device. A highly reliable power storage device. A long-life power storage device. A repeatedly bendable electronic device. A flexible electronic device. The power storage device includes a film, a positive electrode, and a negative electrode. The film includes a plurality of projections. A difference between the maximum height and the minimum height of a surface of the film is greater than or equal to 0.15 mm and less than 0.8 mm. The modulus of rigidity of the film is less than 6.5×10⁹ N. The film includes a metal layer. The thickness of the metal layer is greater than or equal to 5 μm and less than or equal to 200 μm. The positive electrode and the negative electrode are surrounded by the film.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an object, a method, or a manufacturing method. The present invention relates to a process, a machine, manufacture, or a composition of matter. In particular, one embodiment of the present invention relates to a semiconductor device, a display device, a light-emitting device, a power storage device, a memory device, a driving method thereof, a manufacturing method thereof, or an evaluation method thereof. In particular, one embodiment of the present invention relates to a power storage device, a manufacturing method thereof, and an evaluation method thereof.[0003]Note that a power storage device in this specification refers to every element and / or device having a function of storing electric power.[0004]2. Description of the Related Art[0005]In recent years, a variety of power storage devices, for example, secondary batteries such as lithium-ion secondary batteries, lithium-ion capacitor...

AI Technical Summary

Benefits of technology

[0007]Entry of impurities into a power storage device reduces the characteristics of the power storage device. For example, impurities such as water entering a nonaqueous electrolytic solution reduces discharge capacity in some cases. Poor airtightness of an exterior body of a power storage device, for example, might allow components in the air to go into the exterior body, which might result in entry of impurities into the power storage device.

Problems solved by technology

Entry of impurities into a power storage device reduces the characteristics of the power storage device.

For example, impurities such as water entering a nonaqueous electrolytic solution reduces discharge capacity in some cases.

Poor airtightness of an exterior body of a power storage device, for example, might allow components in the air to go into the exterior body, which might result in entry of impurities into the power storage device.

Power storage devices incorporated in electronic devices used while being worn on human bodies might be repeatedly bent at the moment of repeatedly attaching and detaching the electronic devices.

The repeated bending of the power storage devices causes deterioration of their exterior bodies, possibly allowing entry of impurities such as moisture into the exterior body.

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